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A call graph of a program represents the information which executable program element calls which other executable program elements. Based on the call graph, points-to sets can be computed, which represent the memory locations a reference variable can possibly point to. Call graph and points-to sets provide important information for static program analysis. This is especially true for PLC programs...
This paper presents a multivariable relay-based PID autotuning strategy, which ensures a specified modulus margin (i.e. robustness). The algorithm is applied on the coupled quadruple tanks from Quanser. The system is challenging for control since it presents non-minimum phase transmission zeros. The performance of the autotuner is validated against a computer-aided design tool based on the frequency...
Current trends like Cloud Computing dissolve the known structure of the automation pyramid and lead towards a higher level of connectivity between different networks. Classical security methods like separation do not necessarily yield the needed level of protection. This paper describes the evaluation of a new security layer to protect the PROFINET communication by cryptographic means under real-time...
Model-driven and component-based approaches, such as the IEC 61499 standard, allow us to apply analysis to systems in early stages of development. When applied to embedded systems, early analysis can help guide the development process of both the software and the hardware platform, and thus reduce the time and cost of the development. In this paper we present a method for early analysis of device...
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